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Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 22, 2017 | Oct. 11, 2016 | Sep. 27, 2012 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Common Stock Repurchase |  |  |  |  |  |
Repurchase of common stock authorized by Board of Directors |  |  | $ 100,000 | $ 60,000 |  |
Number of years for repurchase of common stock |  |  | 5 years |  |  |
Common stock repurchased, value |  |  |  | $ 16,205 | $ 3,546 | $ 28,958
Shares issued |  |  |  | 2,500,000 | 2,500,000 |
Par value |  |  |  | $ 0.01 | $ 0.01 |
Dividend rate (as a percent) |  |  |  | 6.50% |  |
Liquidation preference |  |  |  | $ 20.00 |  |
Redemption price |  |  |  | $ 20.00 |  |
Common Stock |  |  |  |  |  |
Common Stock Repurchase |  |  |  |  |  |
Common stock repurchased (in shares) |  |  |  | 472,000 | 155,312 | 1,212,000
Common stock repurchased, value |  |  |  | $ 5 | $ 2 | $ 12
Preferred Stock |  |  |  |  |  |
Common Stock Repurchase |  |  |  |  |  |
Shares issued |  |  |  |  | 1,500,000 | 1,000,000
Redeemable Preferred Stock |  |  |  |  |  |
Common Stock Repurchase |  |  |  |  |  |
Shares issued |  | 1,000,000 |  |  |  |
Par value |  | $ 0.01 |  |  |  |
Dividend rate (as a percent) |  | 6.50% |  |  |  |
Purchase price |  | $ 20.00 |  |  |  |
Net proceeds after deducting investor fees |  |  |  | 19,800 |  |
Series A-1 Preferred Stock |  |  |  |  |  |
Common Stock Repurchase |  |  |  |  |  |
Preferred stock dividends paid |  |  |  | 3,200 |  |
Series A-2 Preferred Stock |  |  |  |  |  |
Common Stock Repurchase |  |  |  |  |  |
Shares issued | 1,500,000 |  |  |  |  |
Par value | $ 0.01 |  |  |  |  |
Dividend rate (as a percent) | 6.50% |  |  |  |  |
Purchase price | $ 20.00 |  |  |  |  |
Net proceeds after deducting investor fees |  |  |  | $ 29,700 |  |
Preferred stock dividends paid |  |  |  |  | $ 1,300 |
Dutch Auction |  |  |  |  |  |
Common Stock Repurchase |  |  |  |  |  |
Weighted average price per share (in dollars per share) |  |  |  | $ 34.36 | $ 22.83 |

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